WO2022113207A1 - 通信制御装置、通信制御システム、通信制御方法、および通信制御プログラム - Google Patents
通信制御装置、通信制御システム、通信制御方法、および通信制御プログラム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
Definitions
- the present disclosure relates to a communication control device, a communication control system, a communication control method, and a communication control program.
- Non-Patent Document 1 and Non-Patent Document 2 disclose examples of communication systems.
- a PON Passive Optical Network
- ONUs Optical Network Units
- OLTs Optical Line Thermals
- TDMA Time Division Multiple Access
- the OLT of Non-Patent Document 1 includes an OLT server, a NIC (Network Interface Card), and a TRx (Transceiver).
- Ethernet LFS Link Fat Signaling
- the present disclosure provides a communication control device, a communication control system, a communication control method, and a communication control program that make it difficult to reduce the efficiency of bandwidth utilization.
- the communication control device completes the synchronization process after receiving the transmission time storage unit that stores the transmission time of the optical signal between each of the plurality of ONUs and the optical signal of each of the plurality of ONUs.
- a synchronization time acquisition unit that acquires the synchronization time until the signal is transmitted, an optical transmission control unit that is transmitted to the plurality of ONUs and generates control information for controlling transmission start and transmission end of an optical signal in each of the plurality of ONUs.
- the first ONU that stores the control information generated by the optical transmission control unit and the transmission time storage unit for the first ONU as the first time when the reception of the optical signal from the first ONU is terminated among the plurality of ONUs.
- the communication control system includes the above-mentioned communication control device and a failure detection unit for detecting a link failure between the plurality of ONUs.
- the communication control device receives a transmission time storage step for storing the transmission time of an optical signal between each of the plurality of ONUs and the optical signal of each of the plurality of ONUs.
- a synchronization time acquisition step for acquiring the synchronization time from to the end of the synchronization process, and an optical signal transmitted to the plurality of ONUs and generating control information for controlling transmission start and transmission end of optical signals in each of the plurality of ONUs.
- the transmission control step and the first time when the reception of the optical signal from the first ONU among the plurality of ONUs is terminated are set to the first ONU with the control information generated in the optical transmission control step and the transmission time storage step.
- the first calculation step calculated by using the transmission time between the first ONU and the first ONU stored in the above, and the reception of the optical signal from the second ONU that transmits the optical signal next to the first ONU among the plurality of ONUs. Failure to detect a link failure between the second calculation step, which calculates the second time at which the synchronization process ends after the start, using the synchronization time acquired in the synchronization time acquisition step, and the plurality of ONUs.
- a failure detection suppression step for suppressing the detection of a link failure by designating a period from the first time calculated in the first calculation step to the second time calculated in the second calculation step in the detection unit. , Is the way to do it.
- the communication control device receives a transmission time storage step for storing the transmission time of an optical signal between each of the plurality of ONUs and the optical signal of each of the plurality of ONUs.
- a synchronization time acquisition step for acquiring the synchronization time from to the end of the synchronization process, and an optical signal transmitted to the plurality of ONUs and generating control information for controlling transmission start and transmission end of optical signals in each of the plurality of ONUs.
- the transmission control step and the first time when the reception of the optical signal from the first ONU among the plurality of ONUs is terminated are set to the first ONU with the control information generated in the optical transmission control step and the transmission time storage step.
- the first calculation step calculated by using the transmission time between the first ONU and the first ONU stored in the above, and the reception of the optical signal from the second ONU that transmits the optical signal next to the first ONU among the plurality of ONUs. Failure to detect a link failure between the second calculation step, which calculates the second time at which the synchronization process ends after the start, using the synchronization time acquired in the synchronization time acquisition step, and the plurality of ONUs.
- the suppression start step for causing the detection unit to start suppressing the detection of the link failure from the first time calculated in the first calculation step, and the second calculation for the failure detection unit in the second calculation step. It is a method of executing the suppression end step of ending the suppression of the detection of the link failure at the time.
- the communication control program receives the transmission time storage step for storing the transmission time of the optical signal between each of the plurality of ONUs and the optical signal of each of the plurality of ONUs in the communication control device.
- a synchronization time acquisition step for acquiring the synchronization time from to the end of the synchronization process, and an optical signal transmitted to the plurality of ONUs and generating control information for controlling transmission start and transmission end of optical signals in each of the plurality of ONUs.
- the transmission control step and the first time when the reception of the optical signal from the first ONU among the plurality of ONUs is terminated are set to the first ONU with the control information generated in the optical transmission control step and the transmission time storage step.
- the first calculation step calculated by using the transmission time between the first ONU and the first ONU stored in the above, and the reception of the optical signal from the second ONU that transmits the optical signal next to the first ONU among the plurality of ONUs. Failure to detect a link failure between the second calculation step, which calculates the second time at which the synchronization process ends after the start, using the synchronization time acquired in the synchronization time acquisition step, and the plurality of ONUs.
- a failure detection suppression step for suppressing the detection of a link failure by designating a period from the first time calculated in the first calculation step to the second time calculated in the second calculation step in the detection unit. , Is a program to execute.
- the communication control program receives the transmission time storage step for storing the transmission time of the optical signal between each of the plurality of ONUs and the optical signal of each of the plurality of ONUs in the communication control device.
- a synchronization time acquisition step for acquiring the synchronization time from to the end of the synchronization process, and an optical signal transmitted to the plurality of ONUs and generating control information for controlling transmission start and transmission end of optical signals in each of the plurality of ONUs.
- the transmission control step and the first time when the reception of the optical signal from the first ONU among the plurality of ONUs is terminated are set to the first ONU with the control information generated in the optical transmission control step and the transmission time storage step.
- the first calculation step calculated by using the transmission time between the first ONU and the first ONU stored in the above, and the reception of the optical signal from the second ONU that transmits the optical signal next to the first ONU among the plurality of ONUs. Failure to detect a link failure between the second calculation step, which calculates the second time at which the synchronization process ends after the start, using the synchronization time acquired in the synchronization time acquisition step, and the plurality of ONUs.
- the suppression start step for causing the detection unit to start suppressing the detection of the link failure from the first time calculated in the first calculation step, and the second calculation for the failure detection unit in the second calculation step. It is a program that executes the suppression end step that ends the suppression of the detection of the link failure at the time.
- the bandwidth utilization efficiency is less likely to decrease.
- FIG. It is a block diagram of the communication system which concerns on Embodiment 1.
- FIG. It is a figure which shows the example of the structure of the OLT which concerns on Embodiment 1.
- FIG. It is a figure explaining the example of communication control in the communication system which concerns on Embodiment 1.
- FIG. It is a flowchart which shows the example of the operation of the OLT server which concerns on Embodiment 1.
- FIG. It is a flowchart which shows the example of the operation of the OLT server which concerns on Embodiment 2.
- FIG. 1 is a configuration diagram of a communication system 1 according to the first embodiment.
- the PON2 is constructed in communication system 1.
- the PON 2 includes a plurality of ONUs 3, an OLT 4, and an optical turnout 5.
- Each ONU 3 is connected to the optical turnout 5 by the optical communication line 6.
- the optical communication line 6 is, for example, an optical fiber cable or the like.
- the OLT 4 is connected to the optical turnout 5 by the optical communication line 6.
- the optical turnout 5 is an optical passive component such as an optical coupler or an optical splitter.
- Each ONU3 and OLT4 communicates an optical signal through an optical communication line 6 and an optical turnout 5.
- the TDMA technique is used for uplink communication from ONU3 to OLT4.
- Each ONU3 is located at the base or residence of the subscriber who receives the communication service provided in the communication system 1.
- Each ONU3 is a device that converts an electric signal from a network or the like used by a subscriber into an optical signal and transmits an optical signal to the OLT4 in the uplink communication of the PON2.
- the network used by the subscriber is, for example, a LAN (Local Area Network).
- Each ONU3 includes a TRx7a, a NIC8a, and an ONU server 9a.
- the TRx7a is a device equipped with a function of mutually converting an electric signal and an optical signal.
- NIC8a is a device equipped with a function of processing communication according to a standard such as Ethernet (registered trademark).
- the ONU server 9a is a device equipped with a function of controlling communication between the NIC8a and the TRx7a and the OLT4.
- the OLT 4 is located at a base of a business operator that provides a communication service in the communication system 1.
- the OLT 4 is a device that receives an optical signal from each ONU 3 and converts an optical signal into an electric signal to an upper network or the like in the uplink communication of the PON 2.
- the upper network is, for example, the Internet.
- the OLT 4 includes a TRx7b, a NIC8b, and an OLT server 9b.
- the TRx7b is a device equipped with a function of mutually converting an electric signal and an optical signal.
- NIC8b is a device equipped with a function of processing communication according to a standard such as Ethernet.
- the OLT server 9b is a device equipped with a function of controlling communication between each ONU3 by NIC8b and TRx7b.
- the OLT server 9b is an example of a communication control device.
- OLT4 is an example of a communication control system.
- FIG. 2 is a diagram showing an example of the configuration of OLT 4 according to the first embodiment.
- the NIC8b has an Ethernet unit 10.
- the Ethernet unit 10 is a portion that processes an Ethernet frame or the like.
- the Ethernet unit 10 is, for example, an Ethernet controller in NIC8b or the like.
- the Ethernet unit 10 includes a failure detection unit 11.
- the failure detection unit 11 is a part that detects a link failure with each ONU3.
- the failure detection unit 11 is a part that performs LFS processing specified in, for example, Ethernet.
- the link failure detected by the failure detection unit 11 includes, for example, a collision situation of optical signals that simultaneously receive optical signals from a plurality of ONUs 3.
- the link failure detected by the failure detection unit 11 includes, for example, a situation in which an optical signal is not received from any ONU3.
- the OLT server 9b includes a transmission time storage unit 12, an optical transmission control unit 13, a synchronization time acquisition unit 14, and a failure detection suppression unit 15.
- Each function of the OLT server 9b, such as the optical transmission control unit 13, the transmission time storage unit 12, the synchronization time acquisition unit 14, and the failure detection suppression unit 15, is executed based on, for example, the communication control program installed in the OLT server 9b. Will be done.
- the communication control program installed in the OLT server 9b may be, for example, one recorded on a recording medium.
- the transmission time storage unit 12 is a part that stores information.
- the transmission time of the optical signal between the OLT 4 and each ONU 3 is stored.
- the transmission time to and from each ONU3 is measured, for example, when the ONU3 is connected.
- the transmission time is, for example, an RTT (Round Trip Time) acquired in Ethernet.
- the measured transmission time is stored in the transmission time storage unit 12.
- the transmission time with each ONU3 may be updated every time communication with the ONU3 is performed.
- the optical transmission control unit 13 is a part that generates control information for controlling the transmission start and transmission end of the optical signal in each ONU3.
- the control information is transmitted to each ONU 3 through NIC8b and TRx7b, an optical communication line 6, an optical turnout 5, and the like.
- the control information is, for example, an Ethernet GATE frame.
- the control information transmitted to each ONU 3 includes, for example, information such as whether or not the optical signal can be transmitted from the ONU 3, the transmission start time of the optical signal, and the transmission duration of the optical signal.
- the control information may include information on the transmission time stored in the transmission time storage unit 12.
- the optical transmission control unit 13 generates control information based on, for example, transmission request information received from each ONU 3.
- the transmission request information is, for example, an Ethernet REPORT frame.
- the synchronization time acquisition unit 14 is a part for acquiring the synchronization time.
- the synchronization time is the time from the reception of the optical signal of each ONU3 to the end of the synchronization process.
- the synchronization time may be a time starting from a time when the output of the received optical signal is stable.
- the starting point of the synchronization time is, for example, the time when the output of the LOS pin of TRx7b is switched.
- the end point of the synchronization time is, for example, the time when NIC8b detects Ethernet synchronization.
- the NIC8b is linked down by the LFS when the Ethernet cannot be synchronized, for example, in the situation of a link failure in which an optical signal is not received from any ONU3.
- NIC8b links up when Ethernet is synchronized.
- the synchronization time acquisition unit 14 acquires the synchronization time, for example, with the timing of this link-up as the end point.
- the synchronization time acquisition unit 14 acquires the synchronization time by calculation, for example.
- the synchronization time acquisition unit 14 may acquire the value of the synchronization time used for communication control based on the measured value of the past synchronization time.
- the fault detection suppression unit 15 is a portion that suppresses the detection of link failure by the fault detection unit 11.
- the failure detection suppression unit 15 outputs, for example, a control command for suppressing the detection of a link failure to the failure detection unit 11 by designating a period from the first time to the second time.
- the fault detection unit 11 is equipped with a function of calculating the first time and the second time.
- the device of communication system 1 includes, for example, OLT servers 9b, NIC8b, and TRx7b, as well as ONU servers 9a, NIC8a, TRx7a, and the like.
- the device of communication system 1 has a processing circuit including, for example, a processor and a memory as hardware.
- the processor is, for example, a CPU, an arithmetic unit, a microprocessor, or a microcomputer.
- the memory corresponds to, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM and EEPROM, or a magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD or the like.
- the memory stores, for example, a program as software or firmware.
- the device of the communication system 1 executes preset processing by executing a program or the like stored in the memory by the processor, and realizes each function as a result of the cooperation between the hardware and the software.
- Each function of the device of the communication system 1 may be realized by a processing circuit. Alternatively, some or all of the functions of the device of the communication system 1 may be collectively realized by the processing circuit.
- the processing circuit may be realized by, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, or an FPGA, or a combination thereof.
- FIG. 3 is a diagram illustrating an example of communication control in the communication system 1 according to the first embodiment.
- the horizontal axis represents time.
- the transmission time is measured by the round trip of the optical signal between the ONU3 and the OLT4.
- the OLT server 9b acquires the information represented by the optical signal from each ONU3 through TRx7b and NIC8b.
- the transmission time storage unit 12 of the OLT server 9b stores the transmission time measured here.
- each ONU3 connected to PON2 transmits an optical signal to OLT4 in burst mode.
- Each ONU3 transmits the transmission request information to the OLT 4 based on the amount of data received from the network or the like used by the subscriber.
- the optical transmission control unit 13 of the OLT server 9b allocates a band to each ONU3 based on the transmission request information received from each ONU3.
- the optical transmission control unit 13 generates control information to be transmitted to each ONU 3 based on the allocated band.
- the optical transmission control unit 13 transmits control information to each ONU3 through NIC8b and TRx7b.
- the failure detection suppression unit 15 calculates the first time and the second time when, for example, the optical transmission control unit 13 generates control information.
- the first time and the second time are calculated for each set of the ONU3 that transmits the optical signal first and the ONU3 that transmits the optical signal next to the plurality of ONU3s that sequentially transmit the optical signal.
- the ONU 3 that first transmits an optical signal is an example of the first ONU.
- the ONU 3 that subsequently transmits an optical signal is an example of a second ONU.
- ONU3p is followed by ONU3q to transmit an optical signal.
- the failure detection suppression unit 15 calculates the first time using the control information and the transmission time.
- the fault detection suppression unit 15 calculates the time when the OLT 4 ends the reception of the optical signal from the ONU3p by using, for example, the transmission start time and the transmission continuation time in the control information for the ONU3p, and the transmission time between the ONU3p and the ONU3p.
- the fault detection suppressing unit 15 sets the time calculated here as the first time for the set of ONU3p and ONU3q.
- the failure detection suppression unit 15 calculates the first time using the synchronization time.
- the failure detection suppression unit 15 started receiving an optical signal from the ONU3q using, for example, the transmission start time in the control information for the ONU3q, the transmission time with the ONU3q, and the synchronization time acquired by the synchronization time acquisition unit 14. Calculate the time when the synchronization process ends later.
- the fault detection suppressing unit 15 sets the time calculated here as the second time for the set of ONU3p and ONU3q.
- the failure detection suppression unit 15 outputs a control command for suppressing the detection of the link failure by designating the calculated period from the first time to the second time for the set of ONU3p and ONU3q to the failure detection unit 11.
- the fault detection suppression unit 15 also outputs control commands to the fault detection unit 11 for other ONU3 sets.
- the ONU3p starts transmitting the optical signal from the transmission start time when the optical signal can be transmitted in the control information received from the OLT4.
- the ONU3p ends the transmission of the optical signal when the transmission duration of the control information has elapsed.
- the OLT 4 ends the reception of the optical signal from the ONU3p after the transmission time is delayed from the time when the ONU3p ends the transmission of the optical signal. Since the time at this time is the first time, the failure detection suppressing unit 15 starts suppressing the detection of the link failure from that time.
- the OLT 4 does not receive an optical signal from any of the ONUs 3, but the failure detection unit 11 does not detect the link failure because it is within the period specified by the control command received from the failure detection suppression unit 15.
- the ONU3q starts transmitting the optical signal from the transmission start time when the optical signal can be transmitted in the control information received from the OLT4.
- the ONU3q may transmit an idle signal until the synchronization time included in the control information has elapsed.
- the ONU3q starts transmitting the data signal after the synchronization time has elapsed.
- the data signal is an optical signal including data from the network connected to ONU3q to the network connected to OLT4.
- the OLT 4 starts receiving the optical signal from the ONU3q after a delay in the transmission time from the time when the ONU3q starts transmitting the optical signal. Then, after the synchronization time has elapsed, the OLT 4 starts receiving the data signal from the ONU3q. Since the time at this time is the second time, the failure detection suppressing unit 15 ends the suppression of the detection of the link failure at the time.
- the fault detection unit 11 occurs when the optical signal from the ONU3q is interrupted or when an optical signal collision occurs in the OLT 4. Detects a link failure.
- FIG. 4 is a flowchart showing an example of the operation of the OLT server 9b according to the first embodiment.
- step S1 the transmission time storage unit 12 stores the transmission time measured with each ONU 3.
- step S2 the synchronization time acquisition unit 14 acquires the synchronization time in the OLT 4.
- step S3 the optical transmission control unit 13 generates control information for each ONU3.
- the generated control information is transmitted to each ONU3.
- step S4 the failure detection suppressing unit 15 calculates the first time.
- step S5 the failure detection suppressing unit 15 calculates the second time.
- step S6 the failure detection suppressing unit 15 causes the failure detection unit 11 to suppress the detection of the link failure by outputting a control command specifying the period from the first time to the second time. After that, the failure detection unit 11 suppresses the detection of the link failure for a designated period.
- step S2 may be executed before step S1.
- Step S1 and step S2 may be omitted as appropriate after being executed once.
- Step S5 may be executed before step S4.
- the execution order of each step may be appropriately changed as long as it does not deviate from the purpose of the present disclosure.
- each step may be executed in parallel as appropriate without departing from the spirit of the present disclosure.
- the OLT 4 includes a NIC 8b having a failure detection unit 11 and an OLT server 9b which is an example of a communication control device.
- the failure detection unit 11 detects a link failure with the ONU 3 connected to the OLT 4.
- the OLT server 9b includes a transmission time storage unit 12, a synchronization time acquisition unit 14, an optical transmission control unit 13, and a failure detection suppression unit 15.
- the transmission time storage unit 12 stores the transmission time of the optical signal between each ONU3 and OLT4.
- the synchronization time acquisition unit 14 acquires the synchronization time from receiving the optical signal of each ONU3 to the end of the synchronization process.
- the optical transmission control unit 13 generates control information transmitted to a plurality of ONUs 3.
- the control information is information that controls the transmission start and transmission end of the optical signal in each ONU3.
- ONU3q transmits an optical signal next to ONU3p.
- the fault detection suppressing unit 15 calculates the first time at which the reception of the optical signal from the ONU3p ends. The first time is calculated using the control information generated by the optical transmission control unit 13 with respect to the ONU 3p and the transmission time between the ONU 3p stored by the transmission time storage unit 12.
- the fault detection suppressing unit 15 calculates a second time at which the synchronization process ends after the reception of the optical signal from the ONU3q is started. The second time is calculated using the synchronization time acquired by the synchronization time acquisition unit 14.
- the failure detection suppressing unit 15 causes the failure detection unit 11 to suppress the detection of the link failure from the first time to the second time. Further, the failure detection suppressing unit 15 causes the failure detection unit 11 to suppress the detection of the link failure by outputting a control command specifying the period from the first time to the second time.
- the OLT server 9b has a transmission time storage step, a synchronization time acquisition step, an optical transmission control step, a first calculation step, a second calculation step, and a failure detection.
- the suppression step and how to perform it is a transmission time storage step is a step of storing the transmission time for each ONU3.
- the synchronization time acquisition step is a step of acquiring the synchronization time in OLT4.
- the optical transmission control step is a step of generating control information transmitted to a plurality of ONU3s.
- the first calculation step is a step of calculating the first time for ONU3p.
- the second calculation step is a step of calculating the second time for ONU3q.
- the failure detection suppression step a period from the first time calculated in the first calculation step to the second time calculated in the second calculation step is designated, and the failure detection unit 11 suppresses the detection of the link failure. It's a step.
- the OLT server 9b has a transmission time storage step, a synchronization time acquisition step, an optical transmission control step, a first calculation step, a second calculation step, and a failure detection. It is a program that executes the suppression step.
- the detection of link failure is suppressed between frames in which a data signal is transmitted in burst mode or the like. Therefore, even if the OLT 4 does not receive the optical signal between these frames, the link failure is not detected. Therefore, since the transmission of the L2 frame is not suppressed, the band utilization efficiency is less likely to decrease. Further, the detection of the link failure becomes effective while the frame including the data signal is transmitted. Therefore, when a link failure actually occurs, the processing corresponding to the link failure is appropriately performed in the communication system 1.
- Embodiment 2 In the second embodiment, the differences from the example disclosed in the first embodiment will be described in particular detail. As for the features not described in the second embodiment, any of the features disclosed in the first embodiment may be adopted.
- FIG. 5 is a flowchart showing an example of the operation of the OLT server 9b according to the second embodiment.
- the OLT server 9b according to the second embodiment operates in the same manner as the OLT server 9b according to the first embodiment in steps S1 to S5. After the second time is calculated in step S5, the operation of the OLT server 9b according to the second embodiment proceeds to step S7.
- the failure detection suppressing unit 15 causes the failure detection unit 11 to start suppressing the detection of the link failure from the first time by the output of the control command specifying the first time. After that, the failure detection unit 11 starts suppressing the detection of the link failure from the first time.
- the failure detection suppressing unit 15 causes the failure detection unit 11 to end the suppression of the detection of the link failure at the second time by outputting the control command specifying the second time. After that, the failure detection unit 11 ends the suppression of the detection of the link failure at the second time.
- step S5 may be executed after step S7.
- step S2 may be executed after step S7.
- step S2 may be executed after step S7.
- at least one of step S2 or step S5 may be executed when the output of the optical signal from ONU3q is stable.
- the fault detection suppressing unit 15 does not have to use the transmission time and the control information for the calculation of the second time.
- the execution order of each step may be appropriately changed as long as it does not deviate from the purpose of the present disclosure.
- each step may be executed in parallel as appropriate without departing from the spirit of the present disclosure.
- the failure detection suppressing unit 15 causes the failure detection unit 11 to start suppressing the detection of the link failure by outputting the control command specifying the first time.
- the failure detection suppression unit 15 causes the failure detection unit 11 to end the suppression of the detection of the link failure by outputting the control command specifying the second time.
- the OLT server 9b starts suppressing the transmission time storage step, the synchronization time acquisition step, the optical transmission control step, the first calculation step, and the second calculation step. It is a method of executing a step and a suppression end step.
- the suppression start step is a step of causing the failure detection unit 11 to start suppressing the detection of the link failure from the first time calculated in the first calculation step.
- the suppression end step is a step in which the failure detection unit 11 ends the suppression of the detection of the link failure at the second time calculated in the second calculation step.
- the transmission time storage step, the synchronization time acquisition step, the optical transmission control step, the first calculation step, the second calculation step, and the suppression start are performed on the OLT server 9b. It is a program that executes a step and a suppression end step.
- the detection of link failure is suppressed between frames in which a data signal is transmitted in burst mode or the like. Therefore, even if the OLT 4 does not receive the optical signal between these frames, the link failure is not detected. Therefore, since the transmission of the L2 frame is not suppressed, the band utilization efficiency is less likely to decrease. Further, the detection of the link failure becomes effective while the frame including the data signal is transmitted. Therefore, when a link failure actually occurs, the processing corresponding to the link failure is appropriately performed in the communication system 1.
- the communication control system according to the present disclosure can be applied to a communication system.
- the communication control device according to the present disclosure can be applied to the communication control system.
- the communication control method according to the present disclosure can be applied to a communication system including the communication control device.
- the communication control program according to the present disclosure can be applied to the communication control device.
- 1 communication system 2 PON, 3 ONU, 4 OLT, 5 optical branching device, 6 optical communication line, 7a, 7b TRx, 8a, 8b NIC, 9a ONU server, 9b OLT server, 10 Ethernet section, 11 failure detector, 12 Transmission time storage unit, 13 Optical transmission control unit, 14 Synchronous time acquisition unit, 15 Failure detection suppression unit
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Abstract
Description
本開示に係る通信制御方法は、通信制御装置が、複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻からリンク障害の検知の抑制を開始させる抑制開始ステップと、前記障害検知部に、前記第2算出ステップにおいて算出された前記第2時刻にリンク障害の検知の抑制を終了させる抑制終了ステップと、を実行する方法である。
本開示に係る通信制御プログラムは、通信制御装置に、複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻からリンク障害の検知の抑制を開始させる抑制開始ステップと、前記障害検知部に、前記第2算出ステップにおいて算出された前記第2時刻にリンク障害の検知の抑制を終了させる抑制終了ステップと、を実行させるプログラムである。
図1は、実施の形態1に係る通信システム1の構成図である。
図3は、実施の形態1に係る通信システム1における通信制御の例を説明する図である。
図3において、横軸は時間を表す。
図4は、実施の形態1に係るOLTサーバ9bの動作の例を示すフローチャートである。
また、障害検知抑制部15は、第1時刻から第2時刻までの期間を指定した制御命令の出力によって、障害検知部11にリンク障害の検知を抑制させる。
また、実施の形態1に係る通信制御方法は、OLTサーバ9bが、伝送時間記憶ステップと、同期時間取得ステップと、光送信制御ステップと、第1算出ステップと、第2算出ステップと、障害検知抑制ステップと、を実行する方法である。伝送時間記憶ステップは、各々のONU3についての伝送時間を記憶するステップである。同期時間取得ステップは、OLT4における同期時間を取得するステップである。光送信制御ステップは、複数のONU3に送信される制御情報を生成するステップである。第1算出ステップは、ONU3pについての第1時刻を算出するステップである。第2算出ステップは、ONU3qについての第2時刻を算出するステップである。障害検知抑制ステップは、第1算出ステップにおいて算出された第1時刻から前記第2算出ステップにおいて算出された第2時刻までの期間を指定して、障害検知部11にリンク障害の検知を抑制させるステップである。
また、実施の形態1に係る通信制御プログラムは、OLTサーバ9bに、伝送時間記憶ステップと、同期時間取得ステップと、光送信制御ステップと、第1算出ステップと、第2算出ステップと、障害検知抑制ステップと、を実行させるプログラムである。
実施の形態2において、実施の形態1で開示される例と相違する点について特に詳しく説明する。実施の形態2で説明しない特徴については、実施の形態1で開示される例のいずれの特徴が採用されてもよい。
また、実施の形態2に係る通信制御方法は、OLTサーバ9bが、伝送時間記憶ステップと、同期時間取得ステップと、光送信制御ステップと、第1算出ステップと、第2算出ステップと、抑制開始ステップと、抑制終了ステップと、を実行する方法である。抑制開始ステップは、第1算出ステップにおいて算出された第1時刻からリンク障害の検知の抑制を障害検知部11に開始させるステップである。抑制終了ステップは、第2算出ステップにおいて算出された前記第2時刻にリンク障害の検知の抑制を障害検知部11に終了させるステップである。
また、実施の形態2に係る通信制御プログラムは、OLTサーバ9bに、伝送時間記憶ステップと、同期時間取得ステップと、光送信制御ステップと、第1算出ステップと、第2算出ステップと、抑制開始ステップと、抑制終了ステップと、を実行させるプログラムである。
Claims (8)
- 複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶部と、
前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得部と、
前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御部と、
前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御部が生成する制御情報および前記伝送時間記憶部が記憶する前記第1ONUとの間の伝送時間を用いて算出し、前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得部が取得する同期時間を用いて算出し、前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1時刻から前記第2時刻までの間リンク障害の検知を抑制させる障害検知抑制部と、
を備える通信制御装置。 - 前記障害検知抑制部は、前記第1時刻から前記第2時刻までの期間を指定した制御命令の出力によって前記障害検知部にリンク障害の検知を抑制させる
請求項1に記載の通信制御装置。 - 前記障害検知抑制部は、前記第1時刻を指定した制御命令の出力によって前記障害検知部にリンク障害の検知の抑制を開始させ、前記第2時刻を指定した制御命令の出力によって前記障害検知部にリンク障害の検知の抑制を終了させる
請求項1に記載の通信制御装置。 - 請求項1から請求項3のいずれか一項に記載の通信制御装置と、
前記複数のONUとの間のリンク障害を検知する障害検知部と、
を備える通信制御システム。 - 通信制御装置が、
複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、
前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、
前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、
前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、
前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、
前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻から前記第2算出ステップにおいて算出された前記第2時刻までの期間を指定してリンク障害の検知を抑制させる障害検知抑制ステップと、
を実行する通信制御方法。 - 通信制御装置が、
複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、
前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、
前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、
前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、
前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、
前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻からリンク障害の検知の抑制を開始させる抑制開始ステップと、
前記障害検知部に、前記第2算出ステップにおいて算出された前記第2時刻にリンク障害の検知の抑制を終了させる抑制終了ステップと、
を実行する通信制御方法。 - 通信制御装置に、
複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、
前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、
前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、
前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、
前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、
前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻から前記第2算出ステップにおいて算出された前記第2時刻までの期間を指定してリンク障害の検知を抑制させる障害検知抑制ステップと、
を実行させる通信制御プログラム。 - 通信制御装置に、
複数のONUの各々との間の光信号の伝送時間を記憶する伝送時間記憶ステップと、
前記複数のONUの各々の光信号を受信してから同期処理が終了するまでの同期時間を取得する同期時間取得ステップと、
前記複数のONUに送信され前記複数のONUの各々における光信号の送信開始および送信終了を制御する制御情報を生成する光送信制御ステップと、
前記複数のONUのうち第1ONUからの光信号の受信を終了する第1時刻を、前記第1ONUに対して前記光送信制御ステップにおいて生成された制御情報および前記伝送時間記憶ステップにおいて記憶された前記第1ONUとの間の伝送時間を用いて算出する第1算出ステップと、
前記複数のONUのうち前記第1ONUの次に光信号を送信する第2ONUからの光信号の受信を開始した後で同期処理が終了する第2時刻を、前記同期時間取得ステップにおいて取得された同期時間を用いて算出する第2算出ステップと、
前記複数のONUとの間のリンク障害を検知する障害検知部に、前記第1算出ステップにおいて算出された前記第1時刻からリンク障害の検知の抑制を開始させる抑制開始ステップと、
前記障害検知部に、前記第2算出ステップにおいて算出された前記第2時刻にリンク障害の検知の抑制を終了させる抑制終了ステップと、
を実行させる通信制御プログラム。
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